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Old 01-18-2013, 01:31 PM   #1
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teflon tape vs pipe dope


When connecting pipe fittings which is better? I had a carpenter tell me to use both. Does it matter if it's iron vs brass??

Edit- this is for a water line


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Old 01-18-2013, 01:38 PM   #2
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teflon tape vs pipe dope


Going to get three differant ansewers for this one. All three will work.

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Old 01-18-2013, 02:20 PM   #3
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teflon tape vs pipe dope


Ayuh,.... Personally,... I've never found a joint where pipe dope won't work,.... 'n work Well...
But,...
There's Many joints that pipe Tape, Absolutely won't work....
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Old 01-18-2013, 02:27 PM   #4
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teflon tape vs pipe dope


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When connecting pipe fittings which is better? I had a carpenter tell me to use both. Does it matter if it's iron vs brass??

Edit- this is for a water line
Let me ask a question to you- what is the purpose of tape or dope?
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Old 01-18-2013, 02:29 PM   #5
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Let me ask a question to you- what is the purpose of tape or dope?
Is this a rhetorical question??
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Old 01-18-2013, 02:37 PM   #6
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teflon tape vs pipe dope


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Is this a rhetorical question??
No The intent of dope or tape is to lubricate threads. If the threads are properly cut, the argument could be made that they'll seal themselves.
I feel safe using only dope. Others use both. Still others rely on tape.
So do whichever you please- someone will complain or have a better way.
I'm sure someone has commissioned a study on this subject
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Old 01-18-2013, 02:51 PM   #7
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teflon tape vs pipe dope


I use the white teflon dope. The fact is, that the fittings that you find in the big box stores are obviously foreign made and I have seen some that are actually oval. You can also see starts and stops in the thread form. Pipe Nipples have the same problem, often not round. This gives you a false impression of how tight they are in some cases. In theory Eplumb is absolutely correct, though. Lubrication NPT are tapered.
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Old 01-18-2013, 03:44 PM   #8
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teflon tape vs pipe dope


Thanks guys. I'll double it up for good measure. Thanks!
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Old 01-18-2013, 06:38 PM   #9
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teflon tape vs pipe dope


OK, stupid question.
What is pipe dope? I used teflon tape (2 layers) under my bathroom sink when I changed out the valves and ones leaking. A buddy gave my the blue teflon tape and suggested 3 layers used in gas piping, says a number of plumbers recommended it to him.


This is a picture before replacing the Valves.
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Old 01-18-2013, 07:12 PM   #10
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teflon tape vs pipe dope


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OK, stupid question.
What is pipe dope?
Ayuh,.... This is 1 of My favorites,...

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Old 01-18-2013, 07:58 PM   #11
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teflon tape vs pipe dope


There is a practical difference between using pipe dope and tape. Dope can get messy. So for example if you're doing a toilet supply connection of the type shown in the photo, there's a compression seal in there. If you were to get pipe dope in there, it might not seal correctly. Whereas tape will not cause that same problem. It's easy to wrap around the threads, and it's solid like actual tape so it's not going to grunge up something it shouldn't.

I can tell you I've read plumbing fixture instructions that explicitly said "don't use pipe dope". Not sure of the reason, but there you are.

It can never hurt to use teflon tape even where it's not needed, as far as I can tell.
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Old 01-18-2013, 08:04 PM   #12
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teflon tape vs pipe dope


no big deal on this one ....both are designed for thread sealant... some use pipe dope....some use tape....what is the big deal if it don't leak....and if it does leak with tape...try the pipe dope.....or the other way around...this can be put to rest....ben sr
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Old 01-18-2013, 08:08 PM   #13
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teflon tape vs pipe dope


Compression fitting do not need dope or tape--tape could get into the mating surfaces and cause a leak----

For the record---I'm a doper---sometimes with tape on top of it.
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Old 01-18-2013, 08:11 PM   #14
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Yeah, if tape got in there it could possibly cause a leak. I guess what I meant was it's less likely to get in there. If you gob on some pipe dope, you have no idea where it's squeezing to after you thread on the connections. But with tape, you can easily see how it's wrapped, and it's basically impossible for it to move up when you start threading down.
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Old 01-18-2013, 08:20 PM   #15
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teflon tape vs pipe dope


I like Bens answer----use what works for you--if that doesn't work--try the other one--no leaks--no problem

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